#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
template<class T> using V = vector<T>;
using VI = V<int>;
using VL = V<ll>;
using VS = V<string>;
template<class T> using PQ = priority_queue<T, V<T>, greater<T>>;
using graph = V<VI>;
template<class T> using w_graph = V<V<pair<int, T>>>;
#define FOR(i,a,n) for(int i=(a);i<(n);++i)
#define eFOR(i,a,n) for(int i=(a);i<=(n);++i)
#define rFOR(i,a,n) for(int i=(n)-1;i>=(a);--i)
#define erFOR(i,a,n) for(int i=(n);i>=(a);--i)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define out(y,x) ((y)<0||h<=(y)||(x)<0||w<=(x))
#ifdef _DEBUG
#define line cout << "-----------------------------\n"
#define stop system("pause")
#endif
constexpr ll INF = 1000000000;
constexpr ll LLINF = 1LL << 60;
constexpr ll mod = 1000000007;
constexpr ll MOD = 998244353;
constexpr ld eps = 1e-10;
template<class T>inline bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; }return false; }
template<class T>inline bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; }return false; }
inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); }
template<class T>inline istream& operator>>(istream& is, V<T>& v) { for (auto& a : v)is >> a; return is; }
template<class T, class U>inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template<class T>inline V<T> vec(size_t a) { return V<T>(a); }
template<class T>inline V<T> defvec(T def, size_t a) { return V<T>(a, def); }
template<class T, class... Ts>inline auto vec(size_t a, Ts... ts) { return V<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); }
template<class T, class... Ts>inline auto defvec(T def, size_t a, Ts... ts) { return V<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); }
template<class T>inline void print(const T& a) { cout << a << "\n"; }
template<class T, class... Ts>inline void print(const T& a, const Ts&... ts) { cout << a << " "; print(ts...); }
template<class T>inline void print(const V<T>& v) { for (int i = 0; i < v.size(); ++i)cout << v[i] << (i == v.size() - 1 ? "\n" : " "); }
template<class T>inline void print(const V<V<T>>& v) { for (auto& a : v)print(a); }
template<class T>inline T sum(const V<T>& a, int l, int r) { return a[r] - (l == 0 ? 0 : a[l - 1]); }
template<class T>inline void END(T s) { print(s); exit(0); }
void END() { exit(0); }

class unionfind {
    VI par, rank;
    int forest_num;
public:
    unionfind(const int& n) : par(n), rank(n, 1), forest_num(n) {
        FOR(i, 0, n)par[i] = i;
    }
    int root(int x) {
        if (par[x] == x)return x;
        return par[x] = root(par[x]);
    }
    int size(int x) {
        if (par[x] == x)return rank[x];
        return size(par[x]);
    }
    void unite(int x, int y) {
        int rx = root(x), ry = root(y);
        if (rx == ry)return;
        if (rank[rx] < rank[ry]) {
            par[rx] = ry;
            rank[ry] += rank[rx];
        }
        else {
            par[ry] = rx;
            rank[rx] += rank[ry];
        }
        --forest_num;
    }
    bool same(int x, int y) { return root(x) == root(y); }
    int fnum() { return forest_num; }
};

int main() {
    init();

    int n, m, k; cin >> n >> m >> k;
    w_graph<int> g(n);
    FOR(i, 0, m) {
        int a, b, c; cin >> a >> b >> c;
        --a, --b;
        g[a].emplace_back(b, c);
        g[b].emplace_back(a, c);
    }

    {
        VI dp(n, INF);
        dp[0] = 0;
        queue<int> bfs;
        bfs.push(0);
        while (!bfs.empty()) {
            int cur = bfs.front();
            bfs.pop();
            for (auto [to, c] : g[cur]) {
                if (!chmin(dp[to], dp[cur] + 1))continue;
                bfs.push(to);
            }
        }
        if (dp[n - 1] < k)END(0);
    }


    auto check = [&](int x)->bool {
        VI dp(n, INF);
        dp[0] = 0;
        queue<int> bfs;
        bfs.push(0);
        while (!bfs.empty()) {
            int cur = bfs.front();
            bfs.pop();
            for (auto [to, c] : g[cur]) {
                if (!chmin(dp[to], dp[cur] + (c > x)))continue;
                bfs.push(to);
            }
        }
        return dp[n - 1] < k;
    };
    int ng = 0, ok = 500000;
    while (ok - ng > 1) {
        int mid = ok + ng >> 1;
        if (check(mid))ok = mid;
        else ng = mid;
    }
    print(ok);

    return 0;
}